/*
 * Copyright (c) 2021 The Linux Foundation. All rights reserved.
 * Not a contribution
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "memtrack_kgsl.h"
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <log/log.h>

#define DEBUG 0

namespace aidl {
namespace android {
namespace hardware {
namespace memtrack {

int getKgslMemory(int pid, MemtrackType type,
                  std::vector<MemtrackRecord> *records) {
    FILE *fp;
    char line[1024];
    char syspath[128];
    size_t accounted_size = 0;
    size_t unaccounted_size = 0;

    snprintf(syspath, sizeof(syspath), "/d/kgsl/proc/%d/mem", pid);
    fp = fopen(syspath, "r");
    if (fp == NULL) {
        return -EINVAL;
    }

    /* Go through each line of <pid>/mem file and for every entry of type "gpumem"
     * check if the gpubuffer entry is usermapped or not. If the entry is usermapped
     * count the entry as accounted else count the entry as unaccounted.
     */
    while (1) {
        unsigned long size, mapsize;
        char line_type[7];
        char flags[10];
        char line_usage[19];
        int ret, egl_surface_count = 0, egl_image_count = 0;
        if (fgets(line, sizeof(line), fp) == NULL) {
            break;
        }

        /* Format:
         *  gpuaddr useraddr     size    id flags       type            usage sglen mapsize eglsrf eglimg
         * 545ba000 545ba000     4096     1 -----pY     gpumem      arraybuffer     1  4096      0      0
         */
        ret = sscanf(line, "%*x %*x %lu %*d %9s %6s %18s %*d %lu %6d %6d\n",
                       &size, flags, line_type, line_usage, &mapsize,
                       &egl_surface_count, &egl_image_count);
        if (ret == 7 && size != 0) {
            if (unaccounted_size + size < size) {
                fclose(fp);
                return -EINVAL;
            }

            if (type == MemtrackType::GL && (strcmp(line_type, "gpumem") == 0)) {
                if (flags[6] == 'Y') {
                    if (accounted_size + mapsize > accounted_size) {
                        accounted_size += mapsize;
                    }
                    if (mapsize > size) {
                        fclose(fp);
                        return -EINVAL;
                    }
                    unaccounted_size += size - mapsize;
                } else {
                    unaccounted_size += size;
                }
            } else if (type == MemtrackType::GRAPHICS && (strcmp(line_type, "ion") == 0)) {
                if (strcmp(line_usage, "egl_surface") == 0) {
                    unaccounted_size += size;
                }
                else if (egl_surface_count == 0) {
                    unaccounted_size += size / (egl_image_count ? egl_image_count : 1);
                }
            }
        }
    }
    fclose(fp);
    if (accounted_size > 0) {
        MemtrackRecord rec;
        rec.flags = MemtrackRecord::FLAG_SMAPS_ACCOUNTED |
                    MemtrackRecord::FLAG_NONSECURE |
                    MemtrackRecord::FLAG_PRIVATE;
        rec.sizeInBytes = accounted_size;
        records->push_back(rec);
    }
    if (unaccounted_size > 0) {
        MemtrackRecord rec;
        rec.flags = MemtrackRecord::FLAG_SMAPS_UNACCOUNTED |
                    MemtrackRecord::FLAG_NONSECURE |
                    MemtrackRecord::FLAG_PRIVATE;
        rec.sizeInBytes = unaccounted_size;
        records->push_back(rec);
    }
    if (records && !records->empty()) {
        for (auto &v : *records) {
            ALOGI_IF(DEBUG, "getKgslMemory: pid: %d type: %s flags: 0x%x size: %ld bytes", pid,
            aidl::android::hardware::memtrack::toString(type).c_str(), v.flags,
            v.sizeInBytes);
        }
    }
    return 0;
}

}  // namespace memtrack
}  // namespace hardware
}  // namespace android
}  // namespace aidl
